WHILE THERE probably are many tougher hills than the Matterhorn, located in Saddleback Park in Orange County, Calif., I’d wager few have had as many would-be conquerors as our humble mound. Not long ago, we decided to enhance the hill’s image by offering $50 to the first four-stroke, and a like amount for the first two-stroke, that reached the top.
THE Sears Point National was, for press people accustomed to the average AMA National, a sheer delight. The course management personnel, “Craig” Murray and dynamic Bill McCormick, treated the working press like human beings with a job to do, and helped us to feel that we were there for the good of the race and the speedway.
Is piston speed the main factor for long engine life? I have read that “low revvers” don’t necessarily last longer than “high revvers.” At 65 mph, the piston speed for the Honda 450 K-2 is 2157 ft./min. and 2184 ft./min. for the TR6R. Would the K-2 be as reliable as the TR6R? How does the bore/stroke ratio affect engine reliability?
To speak of taste in the atmosphere one feels while reading your reaction to the letter of M.D. Barnard of London, England, (CW, Sept. ’69) is rather incongruous to say the least. Such smugness was uncalled for; you certainly “lost your cool.” You exhibited a distinctly irrational and spiteful manner in your response—such name-calling—no class.
Lawrence of Arabia Couldn't Have Found A Better Way To Die
FOR COL. T.E. LAWRENCE, scholar, author, mystic, champion of the embattled Arabs in World War I, uncorking his SS100 Brough Superior’s 52 horsepower was a rapture and a ravishment. “The burble of my exhaust unwound like a long cord behind me.
Bonneville 1969 had all the tension of a moonshot at the Cape for Don Vesco, out on the salt for the first time with his double-engined Yamaha streamliner. After the tow-away from the start, crewman Jim Chitwood pulls the release wire when Don’s engines fire.
Our Good Friend Charlie Is Better Behaved These Days, But Still Holds His Own With The Superbike Gang.
IN THIS AGE of superbikes, Harley-Davidson’s XLCH Sportster occupies the venerable position of having been around longer than any of the others. Seniority is a disadvantage, in one respect. Some of the newer designs can outdo it in terms of sheer performance, comfort and efficiency.
... In Which The Champagne Ceremony Comes To AMA Racing, And Baumann Wins It.
SEARS POINT International Raceway, California’s newest race course, was the scene of the American Motorcycle Association’s 125-mile National championship road race. The 2.52-mile, 11-turn road course demands the utmost in rider skill and concentration.
Although A Trifle Heavy, It Pleases With Forgiving Handling, Good Balance And — (Surprise!) A Broad Power Band.
BULTACO EL BANDIDO
BULTACO EL BANDIDO
JUST LIKE PEOPLE, motorcycles go through evolutionary stages; some improve, others get worse. Most importantly, some are incapable of evolving quickly enough and so expire, like dinosaurs during the Ice Age. By keeping a sensitive hand on the pulse of American motorcycle competition, Bultaco has managed to keep abreast of the ever-changing racing scene.
A Technical Exploration Of The Important New Advances In Ignition Theory.
PRELUDE: BASIC IGNITION THEORY
CONVENTIONAL IGNITION SYSTEMS
HOW A TRANSISTOR SYSTEM WORKS
CAPACITIVE DISCHARGE: PROS AND CONS
SILICON CONTROLLED RECTIFIER
BOLT-ON ELECTRONIC IGNITION
THE ADVANTAGES OF THE DIODE
AN INTERESTING DEVELOPMENT in the field of engine design during the past few years has been the appearance of electronic ignition systems. These are often called "transistorized." However, some of them do not utilize transistors, so the term is unnecessarily restrictive.
"PEOPLE STANDING IN LINE FOR NEARLY AN HOUR UP THERE. JHST TO USE THE JOHN!"
Something Awry with the OH Road Runs? You Bet. Here's One Dissected In Its Death Throes. Call It 23 Qualms.
QUALMS 15, 16, and 17
THE 29TH QUALM
ONCE UPON a time there were many famous motorcycling events— Laconia and Springfield and Catalina and Langhorne and all the others. Now they are only nostalgic names to be bantered about by those “old-timers” who have more than just two or three years of riding experience.
Santi Herrero’s Crash Throws the 250 Title Race Wide Open
WITH BITTER, bigoted battles between extremist Catholic and Protestant groups raging in the streets of Belfast, it was touch and go whether the Grand Prix would be held at all; the Dundrod circuit is but five miles from the city. At 11 o’clock the night before race day, an attempt was made by the authorities to stop racing, but race organizer Bertie Mann finally persuaded them otherwise.
THE 100-CC CLASS in Sportsman racing has increased by leaps and bounds during the past few years. This is due in part to the increasing number of suitable machines available to the competitively minded enthusiast. The new 100-cc Kawasaki, designated G31M, is such a machine.
Represented by two strong New England teams, the U.S. defeated Canada soundly in the second round of the Canada/USA Challenge Scramble at Copetown, Ontario. For both teams and spectators, the American whitewash was at least a surprise but, just as emphatically, there was no denying the first win in four years was deserved.
North American Imports now offers these brand new, robust shock absorbers for the Yamaha DT-1. The Maverick shock absorber is specifically designed to tame the toughest off-road pounding of desert racing and maintain the hairline accuracy and control necessary for motocross and track racing. These units incorporate a finely machined damper shaft with a full half-inch diameter. The Maverick shocks are completely rebuildable and are also fully tested and guaranteed to maximize long term service and competition reliability. Price is only $32 per pair from North American Imports, Dept. CW-11, P.O. Box 621, Garden Grove, CA 92642. Phone (714) 534-6390.
REVERSE CONE 'PHONES
The appropriate megaphone on your road racer or flattracker can yield 25 percent more horsepower, certainly a premium too great to ignore. The Aragon megaphone is of a patented design developed through extensive dynamometer testing and actual racing conditions. These are strictly racing items, made of quality steel, not a bolt-on gimmick for irritating the populace along public roads or cow trails. Aragon reverse cone megaphones are available for BSA, Triumph, Honda and most other bikes. Custom-built megaphones are available on special order. Price is $18.95. For further information, contact the Aragon Distributing Co., Dept. CW-1 1, 323 W. Maple Ave., Monrovia, CA 91016.
SWINGING FACE SHIELD
Bell Helmets is now marketing these flip-up shields to fit the full coverage Star helmets. The flip-up arrangement simplifies conversation, and the open and close feature solves the fogging problem when not in motion. Also, if you wear glasses you can just flip up the shield to put them on. The shield is made of shatter resistant plastic .060-in. thick and is available in smoke green (No. 238 G), clear (No. 238 C) and yellow (No. 238 Y). The pivot kit (No. 236) is necessary for a one-time installation and costs $1. The shield retails for $2.50. See your Bell Helmet dealer or write Bell Helmets, Dept. CW-11, 2850 E. 29th St., Long Beach, CA 90806.
Flat track and TT racers may purchase the famous Trackmaster frames complete with swinging arm assembly for $385. The units come ready made for BSA and Triumph Twins, HarleyDavidson 45s and Sprints, but designer/ manufacturer Ray Hensley will build frames on special order to accept other powerplants. The frames are made of chrome moly tubing, nickel plated, and have a complete weight of 31 lb. Trackmaster frames are the choice of such racing stars as Gary Nixon, Neil Keen, Dan Haaby and many others. For further information, write Trackmaster Frames, Dept. CW-1 1, 14646 Blythe Ave. No. 28, Van Nuys, CA 91402.
MINI BASH PLATE
Rare is the minibike that hasn’t bounded through the off-road wilderness. The size and portability of these scooters makes them almost ideal for camping and trailing expeditions. Circle Industries, Dept. CW-1 1, 2536 Seaman Ave., S. El Monte, CA 91733, sells a skid plate tailor-made for the Honda Z-50 Mini. The unit is made of 14-gauge carbon steel and conforms to the exact contours of the bike. It attaches to the frame in front and to the engine in the rear, and no special tools or modifications are required. Complete with accessory hardware, the skid plate costs $9.95. Circle also sells alloy rear wheel sprockets and steel countershaft sprockets for the Z-50 to cut mountains down to size. (Continued on page 76)
With these new fender brackets you can easily fit fenders to your Ceriani motocross forks. The brackets fasten to existing tabs on the fork legs and are chrome plated for appearance. The pair of brackets weighs only 1 lb., 3 oz., and if used with alloy fender and bolts the total weight is only about 3 lb. In order to allow for different wheel sizes, the brackets may be ordered in several hoop heights. So when ordering, please include wheel and tire size. Priced at $10.95, brackets sets (without fender and bolt) can be ordered direct from Steen's, Inc., Dept. CW-l 1, Box 2276-i, Alhambra, CA 91803.
Scientific studies have proven that noise can be just as fatiguing as physical exertion, and the racer is no exception. Modern high performance two-strokes produce noise of a very extreme nature, and constant exposure to it will surely have physical effect. J & R Manufacturing sells a straight-through type silencer that takes the edge off the racket, but not power output. These silencers bolt on to all expansion chambers, and if you have an outsized or odd-shaped stinger J & R will modify one to fit. The sound damping fiberglass filler can be cleaned and reused, but new ones cost only $2. The J & R silencer will not make your bike street legal but will free your ears from that piercing ring-ding note. J & R silencers are available from dealers or direct from J & R Manufacturing, Dept. CW-11, 6001 Maywood Ave., Huntington Park, CA 90255. Price is $8.95.
Roehr Brothers-Van Tech engineers have developed this special leading link front fork. This design offers more efficient shock damping for the roughest going. The fork features a full 6.5-in. travel along with Girling shocks. This design also provides great torsional rigidity to resist side-to-side deflections and twisting. The unit comes in two sizes to fit most bikes; the trail size retails for $99.50, and the big bike item sells for $114.50. For further information, contact Roehr Brothers Inc., Dept. CW-11, 317 N. Victory Blvd., Burbank, CA 91502.
The Hodaka motorcycle is one of the most popular lightweights among the off-road set. And whether it’s an Ace 90 or 100 model, Hodakas are known for pleasant disposition and sturdy construction. Now, Hodaka owners will be pleased to learn that the Hodaka Workshop Manual is available from local dealers for $6.95. This single volume is devoted to both the 90 and 100 machines and is said to be written in terms that the less mechanically oriented owner can understand. Durably printed on heavy stock, the manual measures 7 by 10 in. and weighs nearly 2 lb. If not available locally, order direct from Pabatco, Box 327, Dept. CW-11, Sherman Road, Athena, OR 97818.
A boot designed especially for scrambles and motocross use is offered by Accessory Distributors, Inc., Dept. CW-11, 175 Fair Street, Palisades Park, NJ 07650. It is called the Ashman SC-2 Scrambler boot priced at $34.95. The boot is 18 in. tall and made of leather 1/10-in. thick, with a solid leather insole and leather-lined foot area. Terylene stitching is used throughout, including the sole, which is also reinforced by brass screws. The Ashman SC-2 is available in sizes 7 through 12, and to “D” width. [Ö]
Bultaco of Spain has made available through its American dealers a new line of excellent quality riding apparel. This selection includes such items as motocross gloves, trousers and boots. Trials boots and light gloves are available, as well as a large carry-all bag.
BY <p moved="true">B.R. NICHOLLS</p> The 250 world motocross title battle has been dominated by two men for the entire series: volatile Joel Robert and his countryman, the more reserved Sylvain Geboers. Both Belgian, both CZ riders and both after the title.
The fabulous Honda CB 750 has been fantastically well received in the U.S. and Canada. Over 5000 units have been exported to those countries since its recent introduction and 2000 units are now being assembled monthly. The four-cylinder engine is assembled at Honda’s Saitama factory, near Tokyo, then shipped to Hamamatsu where the frame is fitted to the engine.
Test riding a thoroughbred winner of seven world championships which has been straddled only by Agostini and Hailwood is an exceptional experience, as well as a fabulous piece of luck considering Count Agusta’s jealousy about his racing mounts.